{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,28]],"date-time":"2026-07-28T16:59:20Z","timestamp":1785257960825,"version":"3.55.0"},"reference-count":26,"publisher":"Ovid Technologies (Wolters Kluwer Health)","issue":"14","content-domain":{"domain":["www.ahajournals.org"],"crossmark-restriction":true},"short-container-title":["JAHA"],"published-print":{"date-parts":[[2026,7,21]]},"abstract":"<jats:sec xml:lang=\"en\">\n                    <jats:title>Background<\/jats:title>\n                    <jats:p xml:lang=\"en\">Ventricular arrhythmias (VAs) arising near the left ventricular (LV) summit are often successfully ablated from adjacent anatomic sites. However, the role of bipolar and unipolar electrograms in guiding optimal ablation remains unclear. This study aimed to investigate whether bipolar and unipolar electrogram characteristics can help identify the most effective ablation sites for VAs near the LV summit.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec xml:lang=\"en\">\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p xml:lang=\"en\">\n                      We retrospectively analyzed patients with idiopathic VAs originating from the LV summit, excluding those with structural heart disease or reentrant mechanisms. Electrograms were evaluated at the earliest activation sites within the great cardiac vein\/anterior interventricular vein, aortic sinus of Valsalva, subvalvular LV regions, and the right ventricular outflow tract. Bipolar local activation time (LAT\n                      <jats:sub>Bi<\/jats:sub>\n                      ) and unipolar local activation time were assessed.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec xml:lang=\"en\">\n                    <jats:title>Results<\/jats:title>\n                    <jats:p xml:lang=\"en\">\n                      A total of 78 patients (mean age, 53.9\u00b116.6\u2009years; 59 men) with 80 VAs and 229 mapping points (60 in the great cardiac vein\/anterior interventricular vein, 62 in the aortic sinus of Valsalva, 65 in subvalvular LV regions, and 42 in the right ventricular outflow tract) were analyzed. Ablation was successful at 65 sites. The mean LAT\n                      <jats:sub>Bi<\/jats:sub>\n                      at successful sites was 28.1\u00b121.8\u2009ms. Longer LAT\n                      <jats:sub>Bi<\/jats:sub>\n                      significantly predicted successful ablation (odds ratio, 1.07 [95% CI, 1.02\u20131.12];\n                      <jats:italic toggle=\"no\">P<\/jats:italic>\n                      =0.004). The optimal LAT\n                      <jats:sub>Bi<\/jats:sub>\n                      threshold was 14 ms (sensitivity, 85%; specificity, 44%; area under the curve, 0.67). Unipolar local activation time, LAT\n                      <jats:sub>Bi<\/jats:sub>\n                      \u2212unipolar local activation time differences, unipolar QS morphology, and unipolar waveform characteristics did not predict success.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec xml:lang=\"en\">\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p xml:lang=\"en\">\n                      Early LAT\n                      <jats:sub>Bi<\/jats:sub>\n                      was associated with successful ablation of LV summit VAs, whereas unipolar electrogram features were not independently predictive.\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.1161\/jaha.125.047222","type":"journal-article","created":{"date-parts":[[2026,7,17]],"date-time":"2026-07-17T10:57:39Z","timestamp":1784285859000},"update-policy":"https:\/\/doi.org\/10.1161\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":0,"title":["Characteristics of Bipolar and Unipolar Electrograms at Optimal Ablation Sites for Ventricular Arrhythmias Originating Near the Left Ventricular Summit"],"prefix":"10.1161","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0550-8837","authenticated-orcid":false,"given":"Guan\u2010Yi","family":"Li","sequence":"first","affiliation":[{"name":"Taichung Veterans General Hospital","place":["Taichung, Taiwan"]},{"name":"National Yang Ming Chiao Tung University","place":["Taipei, Taiwan"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8960-1301","authenticated-orcid":false,"given":"Fa\u2010Po","family":"Chung","sequence":"additional","affiliation":[{"name":"National Yang Ming Chiao Tung University","place":["Taipei, Taiwan"]},{"name":"Taipei Veterans General Hospital","place":["Taipei, Taiwan"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8395-1052","authenticated-orcid":false,"given":"Yenn\u2010Jiang","family":"Lin","sequence":"additional","affiliation":[{"name":"National Yang Ming Chiao Tung University","place":["Taipei, Taiwan"]},{"name":"Taipei Veterans General Hospital","place":["Taipei, Taiwan"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9102-227X","authenticated-orcid":false,"given":"Li\u2010Wei","family":"Lo","sequence":"additional","affiliation":[{"name":"National Yang Ming Chiao Tung 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